Spinework

Every print-on-demand platform hands you the same headache

KDP, IngramSpark and every other print-on-demand platform give you a flat PNG "template" with red and blue guide boxes on it, and leave you to build your wraparound cover around it by hand in whatever design software you own. Get the spine width even slightly wrong, or the page count changes after a last edit, and you're redoing the layout from scratch.

The geometry, done for you

Pick a trim size, enter your page count and paper stock, and Spinework calculates the exact spine width, positions the barcode zone where your printer expects it, and builds the whole back-spine-front wrap at true 300dpi — live, as you type.

• Trim size presets — 5×8, 6×9 and the rest, or enter fully custom dimensions
• Spine width auto-calculated from page count and paper stock (white / cream / colour), with a manual override if your printer's numbers differ
• Front cover auto-fit — upload your art and choose "fill panel" for edge-to-edge coverage, or "fit inside guides" if your cover already has finished text near the edges, so nothing gets cropped
• Back cover with an editable blurb that wraps and repositions itself automatically around an optional author photo
• Barcode zone kept clear by construction, sized to the standard ISBN barcode and adjustable if your printer's spec differs
• Bleed and safety guides matching the industry-standard red/blue convention, with a proof export (guides visible) and a clean print-file export (nothing baked in)

Know your canvas before you design

The exact source-image dimensions are shown the moment you set your trim size — so you know precisely what size to design or generate your cover art at for a perfect fit, before you open your design tool or your AI image generator. No cropping, no letterboxing, no guesswork.

Change your mind, the wrap updates itself

Page count moves after a last-minute edit? Switching from white to cream stock? Update the field and the spine width, barcode position and panel widths recalculate instantly — no manual re-measuring, no rebuilding the layout in your design software.

Spinework is a single HTML file — open it in any modern browser and start building your wrap immediately. No installation, no account, no server to run yourself, and it's completely free.

Perfect for: self-published authors preparing a KDP or IngramSpark paperback, indie publishers producing multiple titles, and anyone who's ever had a print-on-demand cover rejected over spine width or a barcode collision.